Added Level singleton to manage the (un)loading of levels and entrypoints

core/globals/levels.gd

@@ -0,0 +1,57 @@
+extends Node
+
+class Entrypoint extends Object:
+	var scene_name: String
+	var player_position: Vector2
+	var reset_physics: bool
+	func _init(
+		scene_name_: String,
+		player_position_: Vector2,
+		reset_physics: bool
+	) -> void:
+		self.scene_name = scene_name_
+		self.player_position = player_position_
+		self.reset_physics = reset_physics
+
+const SCENES = {
+	"intro": "uid://c6w7lrydi43ts"
+}
+
+var ENTRYPOINTS = {
+	"intro_start": Entrypoint.new("intro", Vector2(0, 0), true)
+}
+
+# load that stuff
+
+var level_root: Node
+var player: Node2D
+
+func load_scene(scn_name: String) -> bool:  # returns true on success
+	if level_root == null:
+		push_error("Can't load level, level_root is not registered yet.")
+		return false
+	if not scn_name in SCENES:
+		push_error("Level " + scn_name + " doesn't exist.")
+		return false
+	unload_scene()
+	var scn = load(SCENES[scn_name])
+	level_root.add_child(scn.instantiate())
+	return true
+
+func unload_scene():
+	for c in level_root.get_children():
+		c.queue_free()
+
+func load_entrypoint(ep_name: String) -> bool: # returns true on success
+	if not ep_name in ENTRYPOINTS:
+		push_error("Entrypoint " + ep_name + " doesn't exist.")
+		return false
+	if player == null:
+		push_error("Can't load entrypoint, player is not registered yet.")
+		return false
+	var e: Entrypoint = ENTRYPOINTS[ep_name]
+	if load_scene(e.scene_name):
+		player.position = e.player_position
+		return true
+	else:
+		return false